What frequency range do shortwave radios typically cover?

• A. 1 MHz to 10 MHz
• B. 3 MHz to 30 MHz
• C. 30 MHz to 300 MHz
• D. 300 kHz to 3 MHz

Answer: (B)

Shortwave radios typically cover a frequency range from 3 MHz to 30 MHz. This range is crucial for various forms of long-distance communication, as it allows signals to be reflected off the ionosphere, enabling them to travel great distances. This capability is particularly useful for international broadcasting, maritime communication, and amateur radio.

The specified range also includes frequencies that are less prone to interference from local electrical noise, thereby providing clearer reception for signals originating far away. Frequencies below this range, such as those mentioned in the other options, either fall under different classifications, like medium wave or AM broadcasting, or are not effective for the long-distance propagation characteristics that make shortwave radio unique.

Thus, the correct response aligns with the established frequency bands recognized for shortwave radio usage, making it essential knowledge for anyone involved in radio communications.